I have a citroen Xsara picasso 1.6sx. It has been fully serviced all its life. But over the last few weeks the engine revs up when the car is stopped. You can hear the engine drop revs then back up and few times then it revs very loudly until the engine is turned off or it is driven again. Had the sensors all cleaned but still it does it. It only does it when warmed up though, Also it stalls first thing in the morning.

Jo, July 2010

They think it may be the idle speed control valve finally. It is going in next week hopefully I can get back to you with good news.

Thanks for the answer though if it isn't it i can try yours next.
Jo

Jo, July 2010

i had the same problem and local garage couldn't fix it. i eventually narrowed it down to the stepper motor situated on the throttle body changed it and problem cured. good luck

firestarter, July 2010